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Polymers02:34

Polymers

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The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
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Glycolysis is divided into two phases based on whether energy is utilized or released. While the first phase consumes ATP, the second phase produces energy in the form of ATP and NADH. The energy is released over a sequence of reactions that turns G3P into pyruvate. The energy-releasing phase—steps 6-10 of glycolysis—occurs twice, once for each of the two 3-carbon sugars produced during steps 1-5 of the first phase.
The first energy-releasing step—the 6th step of glycolysis...
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Polymer Classification: Architecture01:14

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Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
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Polymer Classification: Crystallinity01:21

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Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
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Polymer Classification: Stereospecificity01:26

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Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
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Fabricating Reactive Surfaces with Brush-like and Crosslinked Films of Azlactone-Functionalized Block Co-Polymers
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Crosslinked-Polymer Brushes with Switchable Capture and Release Capabilities.

Serkan Demirci1,2

  • 1Department of Chemistry, Amasya University, Ipekkoy, Amasya 05100, Turkey. srkndemirci@gmail.com.

Polymers
|April 10, 2019
PubMed
Summary
This summary is machine-generated.

Researchers developed pH- and temperature-switchable polymer brushes using reversible addition-fragmentation chain transfer (RAFT) polymerization. These functional polymer brush-gels demonstrate reversible methylene blue capture and release, showing promise for bioseparation and diagnostics.

Keywords:
RAFT polymerizationbrush gelscrosslinked-polymer brushescyclodextrinresponsive polymer

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Surface Chemistry

Background:

  • Polymer brushes offer versatile surface modification capabilities.
  • Stimuli-responsive materials are crucial for advanced applications.
  • Controlling polymer brush architecture is key for tailored functionalities.

Purpose of the Study:

  • To synthesize pH- and temperature-switchable crosslinked-polymer brushes.
  • To investigate the reversible capture and release properties of these polymer brushes.
  • To explore potential applications in bioseparation and diagnostics.

Main Methods:

  • Surface-initiated reversible addition-fragmentation chain transfer (RAFT) polymerization.
  • Immobilization of RAFT agent on silicon wafer surface.
  • Polymerization of 2-N-morpholinoethyl methacrylate (MEMA) with beta-cyclodextrin methacrylate (CDMA) crosslinker.
  • Characterization using film thickness, water contact angle, and surface morphology analysis.
  • UV-Vis spectroscopy for reversible methylene blue capture and release studies.

Main Results:

  • Successfully synthesized poly(2-N-morpholinoethyl methacrylate) (PMEMA) brush-gels with switchable properties.
  • Demonstrated reversible capture and release of methylene blue over five cycles.
  • Confirmed structural characteristics and surface properties of the resulting polymer brushes.
  • Established the stimuli-responsive behavior of the PMEMA brush-gels.

Conclusions:

  • The developed PMEMA brush-gels exhibit tunable, switchable properties responsive to pH and temperature.
  • These materials show significant potential for applications requiring reversible molecular capture and release.
  • The study highlights the utility of RAFT polymerization for creating advanced functional polymer surfaces.